1/*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25package jdk.nashorn.internal.runtime.arrays;
26
27import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
28
29import java.nio.ByteBuffer;
30import jdk.nashorn.internal.objects.Global;
31import jdk.nashorn.internal.runtime.PropertyDescriptor;
32import jdk.nashorn.internal.runtime.ScriptRuntime;
33
34/**
35 * Implementation of {@link ArrayData} that wraps a nio ByteBuffer
36 */
37final class ByteBufferArrayData extends ArrayData {
38    private final ByteBuffer buf;
39
40    ByteBufferArrayData(final int length) {
41        super(length);
42        this.buf = ByteBuffer.allocateDirect(length);
43    }
44
45    /**
46     * Constructor
47     *
48     * @param buf ByteBuffer to create array data with.
49     */
50    ByteBufferArrayData(final ByteBuffer buf) {
51        super(buf.capacity());
52        this.buf = buf;
53    }
54
55    /**
56     * Returns property descriptor for element at a given index
57     *
58     * @param global the global object
59     * @param index  the index
60     *
61     * @return property descriptor for element
62     */
63    @Override
64    public PropertyDescriptor getDescriptor(final Global global, final int index) {
65        // make the index properties not configurable
66        return global.newDataDescriptor(getObject(index), false, true, true);
67    }
68
69    @Override
70    public ArrayData copy() {
71        throw unsupported("copy");
72    }
73
74    @Override
75    public Object[] asObjectArray() {
76        throw unsupported("asObjectArray");
77    }
78
79    @Override
80    public void setLength(final long length) {
81        throw new UnsupportedOperationException("setLength");
82    }
83
84    @Override
85    public ArrayData shiftLeft(final int by) {
86        throw unsupported("shiftLeft");
87    }
88
89    @Override
90    public ArrayData shiftRight(final int by) {
91        throw unsupported("shiftRight");
92    }
93
94    @Override
95    public ArrayData ensure(final long safeIndex) {
96        if (safeIndex < buf.capacity()) {
97            return this;
98        }
99
100        throw unsupported("ensure");
101    }
102
103    @Override
104    public ArrayData shrink(final long newLength) {
105        throw unsupported("shrink");
106    }
107
108    @Override
109    public ArrayData set(final int index, final Object value, final boolean strict) {
110        if (value instanceof Number) {
111            buf.put(index, ((Number)value).byteValue());
112            return this;
113        }
114
115        throw typeError("not.a.number", ScriptRuntime.safeToString(value));
116    }
117
118    @Override
119    public ArrayData set(final int index, final int value, final boolean strict) {
120        buf.put(index, (byte)value);
121        return this;
122    }
123
124    @Override
125    public ArrayData set(final int index, final double value, final boolean strict) {
126        buf.put(index, (byte)value);
127        return this;
128    }
129
130    @Override
131    public int getInt(final int index) {
132        return 0x0ff & buf.get(index);
133    }
134
135    @Override
136    public double getDouble(final int index) {
137        return 0x0ff & buf.get(index);
138    }
139
140    @Override
141    public Object getObject(final int index) {
142        return 0x0ff & buf.get(index);
143    }
144
145    @Override
146    public boolean has(final int index) {
147        return index > -1 && index < buf.capacity();
148    }
149
150    @Override
151    public boolean canDelete(final int index, final boolean strict) {
152        return false;
153    }
154
155    @Override
156    public boolean canDelete(final long longIndex, final boolean strict) {
157        return false;
158    }
159
160    @Override
161    public ArrayData delete(final int index) {
162        throw unsupported("delete");
163    }
164
165    @Override
166    public ArrayData delete(final long fromIndex, final long toIndex) {
167        throw unsupported("delete");
168    }
169
170    @Override
171    public ArrayData push(final boolean strict, final Object... items) {
172        throw unsupported("push");
173    }
174
175    @Override
176    public Object pop() {
177        throw unsupported("pop");
178    }
179
180    @Override
181    public ArrayData slice(final long from, final long to) {
182        throw unsupported("slice");
183    }
184
185    @Override
186    public ArrayData convert(final Class<?> type) {
187        throw unsupported("convert");
188    }
189
190    private static UnsupportedOperationException unsupported(final String method) {
191        return new UnsupportedOperationException(method);
192    }
193}
194